Support: Pragmatic does not work inside shadow dom

[PirAt39]

Please follow this code snippet

I found a similar issue Support: Web components with shadow dom. Only difference is that here we have pragmatic draggable inside shadow dom. I have a requirement where I have a custom element using Lit.js which is going to contain a list of other custom lit component and I should be able to reorder elements and also be able to drop element in some other dropable custom element. I am stuck in first step, i.e., making the custom element draggable. So I have made above snippet very simple.

As you can see that I have used draggable to make the div.draggable elements draggable. Interesting thing is that, it makes the elements draggable. But event function like onDrag, onDragStart, etc does trigger at all.

cc alexreardon